mechanical engineering MCQs – Page 44

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

861. An ideal gas as compared to a real gas at very high pressure occupies_________________?
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A. more volume

B. less volume

C. unpredictable behaviour

D. same volume

E. no such correlation

862. According to Avogadros law, for a given pressure and temperature, each molecule of a gas_________________?
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A. occupies volume inversely proportional to its specific weight

B. occupies volume proportional to its molecular weight

C. occupies volume proportional to its specific weight

D. occupies same volume

E. occupies volume inversely proportional to its molecular weight

863. A closed system is one in which_________________________?
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A. mass does not cross boundaries of the system, though energy may do so

B. mass crosses the boundary but not the energy

C. neither mass nor energy crosses the boundaries of the system

D. both energy and mass cross the boundaries of the system

E. thermodynamic reactions take place

864. The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will______________?
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A. increase/decrease depending on ap-plication

B. increase

C. decrease

D. remain unchanged

E. unpredictable

865. If the radius of gyration of a compound pendulum about an axis through e.g. is more, then its frequency of oscillation will be_______________?
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A. less

B. more

C. none of the above

D. data are insufficient to determine same

E. same

866. A cam with a roller follower would con stitute following type of pair______________?
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A. close pair

B. open pair

C. cam pair

D. lower pair

E. higher pair

867. The efficiency of Diesei cycle with decrease in cut off_________________?
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A. decreases

B. first increases and then decreases

C. first decreases and then increases

D. increases

E. remains unaffected

868. Temperature of a gas is produced due to________________?
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A. kinetic energy of molecules

B. surface tension of molecules

C. repulsion of molecules

D. its heating value

E. attraction of molecules

869. The following is the inversion of slider crank chain mechanism______________________?
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A. oscillating cylinder engine

B. none of the above

C. Whitworth quick return mechanism

D. hand pump

E. all of the above

870. Peaucellier mechanism has__________________?
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A. twelve links

B. five links

C. four links

D. eight links

E. six links

871. In a non-flow reversible process for which p = (- 3V+ 15) x 105N/m2,V changes from 1 m to 2 m3. The work done will be about_______________?
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A. 10 xlO5 joules

B. 100 xlOO5 joules

C. 10xl04kiojoules

D. 10 xlO5 kilo joules

E. lxlO5 joules

872. Carnot cycle efficiency depends upon________________?
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A. properties of the medium/substance used

B. condition of engine

C. working condition

D. effectiveness of insulating material around the engine

E. temperature range of operation

873. If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as__________________?
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A. hyperbolic expansion

B. free expansion

C. parabolic expansion

D. throttling

E. adiabatic expansion

874. Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits ?
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A. 02, N2, steam, C02

B. steam vapours, H2, C02

C. 02, N2, H2, air

D. S02, NH3, C02, moisture

E. Oz, N2, water vapour

875. Open pairs are those which have__________________?
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A. none of the above

B. two elements that permit relative motion

C. elements of pairs not held together mechanically

D. surface contact between the two ele-ments when in motion

E. point or line contact between the two elements when in motion

876. Which one of the following statements is not correct_________________?
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A. the angle of repose is equal to angle of friction

B. the tangent of the angle of friction is equal to coefficient of friction

C. none of the above

D. the sine of the angle of repose is equal to coefficient to friction

E. the tangent of the angle of repose is equal to coefficient of friction

877. A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227 C and 27 C. His claim is__________________?
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A. cost will be very high

B. theroretically possible

C. not possible

D. justified

E. may be possible with lot of sophistications

878. The condition of perfect vacuum, i.e., absolute zero pressure can be attained at ____________________?
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A. a temperature of 273.16C

B. a temperature of 273 K

C. cant be attained

D. a temperature of 0C

E. a negative pressure and 0C temperature

879. First law of thermodynamics furnishes the relationship between______________________?
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A. heat and internal energy

B. heat, work and properties of the system

C. heat and work

D. various properties of the system

E. various thermodynamic processes

880. The efficiency of a Carnot engine depends on_______________________?
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A. working substance

B. size of engine

C. design of engine

D. temperatures of source and sink

E. type of fuel fired

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